Picked up a used 220 with nite sites the front is a #6, rear is a #8, I shot at 11 yds it was shooting 4-5 inches low,when I raised the front site all the way out of the rear site picture it shot ok,I also shot a target at 6 yds using a normal site picture ( glock or 1911) I was able to shoot out the bullseye of the target,I used two different brands of 230gr ammo, are the sites the correct ones,barrel shot out ?